Adaptive Noise Cancellation for Movable Vehicle Components
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Solution Overview
Problem
Conventional active noise-canceling devices are limited in their ability to effectively reduce noise in mobile apparatuses, particularly when movable components such as seats and doors change positions, leading to unstable noise control and reduced noise reduction effectiveness.
Innovation Solution
A noise reduction device that includes a reference signal receiver, an adaptive filter applier, a cancel signal output unit, a status signal receiver, and a controller, which generates a cancel signal using an adaptive filter with updated coefficients and adjusts the output based on the status of movable components, such as seats and doors, to maintain effective noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional active noise-canceling devices are used in mobile apparatuses, then noise reduction is provided, but the noise control becomes unstable when movable components change positions
Solution Approach 1:
The system dynamically adjusts the noise control parameters based on the position of movable components. The controller receives status signals indicating the position of movable components and modifies the adaptive filter coefficients accordingly, transforming the static noise control system into a dynamic one that adapts to changing conditions within the mobile apparatus.
Solution Approach 2:
The system implements feedback by receiving status signals about movable component positions and using this information to adjust the noise control output. The controller continuously monitors the position status and feeds this information back into the adaptive filter adjustment process, creating a closed-loop control system that maintains stability despite position changes.
2Reliability
If the noise control system does not adapt to movable component positions, then the system complexity is low, but the noise reduction effectiveness decreases
Solution Approach 1:
The controller performs multiple functions: it manages the adaptive filter coefficients for noise cancellation and simultaneously processes status signals from movable components. By integrating these functions into a single control unit, the system achieves adaptability without proportionally increasing overall system complexity.
Solution Approach 2:
The system changes the parameters of the adaptive filter based on movable component positions. Instead of adding complex hardware, the solution modifies the filter coefficients and control parameters dynamically, achieving improved noise reduction effectiveness through parameter adjustment rather than structural complexity.
Data Source
AI summary
A noise reduction device reduces noise occurring in a space inside a mobile apparatus. The noise reduction device includes: a status signal receiver to which a status signal indicating a status of a movable component provided for the mobile apparatus is inputted; and a controller that, when the status signal inputted indicates that the movable component is not in a predetermined base status, performs control over the output of the cancelling sound differently in each case, depending on whether or not the status signal includes information indicating a shift amount of the movable component.